Stop motion for spinning and like textile frames



June 3, 1947. I Q 2,421,555 STOP MOTION FOR SPINNING AND LIKE TEXTILEFRAMES Filed 00 16. 1945 2 Sheets-Sheet 1 June 3, .1947. s, FRASER I 72,421,555

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Patented June 3, 1947 STOP MOTION FOR SPINNING AND LIKE TEXTILE FRAMESGordon Scott Fraser, Arbroath, Scotland, as-

signor to Douglas Fraser & Sons Limited, Arbroath, Angus, Scotland, acorporation of Great Britain Application October 16, 1945, Serial No.622,675

In Great Britain Marcl 5, 1945 2 Claims. (01. 57-84) pivot or aknife-edge, to a point of which block spaced from said fixed pivot orknife-edge is pivotally connected one end of a link pivotally connectedat its opposite end to the forward arm of a manually operable lever. Theseveral pivots are substantially aligned in the position occupied by thedetector or feeler when th detector or feeler is in engagement with thematerial, the

block and the link constituting in effecta toggle device. I

The manually operable lever is mounted between its ends on a fixedpivot, and the remote arm of said lever is pivotally connected to aweighted lever formed adjacent to its pivot with a nose cngageable witha pivotally supported arm carrying the arbor of the retaining pressingroller.

The pivot of said arm may be the pivot of the manually operable lever.

In setting the mechanism the free or forward end of the manuallyoperable lever is depressed, and the toggle brought to approximatelydead centre position; the weighted lever is in raised position, and heldthere as the manually operable lever is latched by the toggle device,while the nose projecting from the weighted lever abuts on thearbor-carrying arm whereby the retaining pressing roller is held againstits companion retaining roller.

An extension of the weighted lever presents a nipping elementco-operative with a stationary nipping element so arranged that onoperation of the stop motion the material is held at a point beneath theretaining rollers before the retaining rollers are separated. j

If, now, on breakage of the material, the detector 01' feeler swingsoutwardly, the toggle is broken, the forward arm of the manuallyoperable lever is tilted upwardly as the weighted lever falls, thematerial is gripped between the nipping elements and held againstfurther feed-in, the arbor-carrying arm is free to tilt and theretaining pressing roller moves under the action of its in the directionaway from its companion retaining roller.

To reduce friction between the link and the block, the lower end of thelink, in lieu of carrying a pivot pin, may be formed with a projectingknife-edge element (the edge of which may be rounded) engaging a,suitably shaped socket opening in the block.

In a modification the arbors of the retaining pressing roller and of thedrawing pressing roller are carried by arms of a multi-armed lever thefulcrum pin of which is movable in a slot, said multi-armed lever beinginfluenced by a spring to withdraw the rollers carried thereby fromtheir companion rollers when the weighted lever falls. In theaccompanying drawings Fig. 1 is an end elevation partly in section of astop-motion according to th invention. Fig. 2 is a detail view of amodified mounting of the link; Fig. 3 is a view similar to Fig. 1 butshowing a modification in which the retainin pressing roller and thedrawing pressing roller are adapted to be moved simultaneously away fromtheir companion rollers. Themechanism illustrated in Fig. 1 includes adetector or feeler I depending from a block 2 formed with a bearing facefor engagement by a fixed knife-edge member 3, to a point 4 of whichblock 2 spaced from the knife-ed e is pivotally connected one end of alink 5 pivotally connected at its opposite end at 6 to the forward arm Iof a manually operable lever. The pivots l and B .are substantiallyaligned with the knife-edge in the position occupied by the detector orfeeler I when the detector or feeler is in engagement with the materialindicated at A, the block 2 and the link 5 constituting in effect atoggle device.

I The manually operable lever is mounted between its ends on a fixedpivot 8, and the remote arm 9 of said lever is pivotally connected to aweighted lever l0 formed adjacent to the pivot 8 with a nose ll,engageable with an arm l2 pivoted at 8 and carrying the arbor l3 of theretaining pressing roller M.

In setting the mechanism the free or forward end of the manuallyoperable lever is depressed, whereby the toggle is allowed to assumeapproximately dead center position in which it is retained by the actionof the material on the feeler I; the weighted lever I0 is in raisedposition, and held there as the manually operable lever 1, 9 is latchedby the toggle device, while the nose II projecting from the weightedlever in abuts on the arbor-carrying arm l2 whereby the retainingpressing roller I4 is held against its comown weight and that of thearbor-carrying arm panion retaining, roller 15.

on breakage of the material, the detector or feeler l swings action ofgravity, the block 2 is rocked so that the knife-edge is no longer inline with the points 4 and 6, and the forward arm 1 of the manuallyoperable lever is tilted upwardly about the pivot 9 by the action of theweighted lever l on the arm 9. The weighted lever l0 swings about itspivotal connection with the lever arm 9, while the extension I of saidlever swings upwardly and grips the material between the nipping elementl1 and the stationary nipping element l8 at a point beneath theretaining roller. With further downward movement of the weighted leverID in an are about the pivotal connection with the lever arm 9, the noseII no longer presses against the arm l2, so that the retaining pressingroller I4 is free to move under the action of its own weight and that ofthe unbalanced arm l2 in the direction away from its companion retainingroller l5.

In the modification shown in Fig. 2 the link 5 presents at its lowerenda knife-edge member 5a engaging the inverted V-shaped upper portionof a recess 2a formed in the block 2.

In the modification illustrated in Fig. 3 the retaining pressing rollerand the drawing pressing roller are jointly movable towards and fromtheir companion rollers, and in this figure parts corresponding to thosein Fig. 1 are indicated by the same reference numerals distinguished bythe addition of the exponent In this construction the link 5' isconnected to an extending arm of a lever 2| crooked at the end remotefrom the link connection 6 and pivoted on a stationary pin 22. The lever2| carries a pin 23 on which is pivoted a manually operable multi-armedlever 24, the forwardly extending arm of which forms a handle 25, whilethe rearwardly extending arm is furnished with a weight 26. A downwardlyextending arm 21 of the lever 24 is furnished with a pin 28 on which isfulcrumed a further multi-arrned lever 29, the pin 28 engaging in a slot30 in a forked arm 3| of the lever 29. The lever 29 carries at itsopposite ends the arbor l3 of the retaining pressing roller l4 and thearbor 32 of the drawing pressing roller I9, respectively.

A tension spring 33 is connected at one end to the lever 29 and at theopposite end to a stationary part of the frame.

The retaining pressing roller 14 and the drawing pressing roller l9 arenormally held pressed against their respective companion rollers l5 and20' with the material interposed in the nips of said rollers, bypressure of the pin 28 against the end wall of the slot 30 under theinfluence of the weighted lever 24.

When, now, on breakage or failure of the material, the detector orfeeler I swings outwardly, the toggle is broken, the block 2 leaves theknife- 4 edge member 3 and the lever 24 is tilted and tilts the lever 2|about the pivot 22. At the same time the weighted lever 24 is retractedin the direction of the arrow B by means of a projecting finger 34 onthe lever 24 coming into contact with and sliding down an inclinedsurface presented by a slide member 35 extending angularly from thestationary frame. This retractive movement of the lever 24 draws thepressure pin 29 backwards in the slot 30, whereby the pressure of theretaining rollers l4, I9 is released, the movement of the pin 28providing a clearance in the slot 30 which permits the spring 33 towithdraw the lever 29 and move the rollers l4 and 9' avsay fromtheir-respective companion rollers The backward movement of the lever 29is limited by a fixed stop 36 and by an extension arm 31 of the lever2|.

The mechanism is reset by means of the handle 25 operating the weightedlever 24.

What is claimed is:

l. A stop motion mechanism for spinning and like textile frames having aretaining pressing roller, and a companion roller, comprising a memberaffording a pivot bearing and a feeler forming with said member a unit,a stationary knifeedged member engageable with the bearing, a linkhaving at one end a permanent pivotal connection with said firstmentioned member, a lever to which said link is pivoted at its otherend, said link and said first mentioned member constituting limbs of atoggle, and a weight device influencing said lever, said weight-devicenormally functioning to urge the retaining pressing roller against itscompanion roller, but being free to fall on the breaking of the toggle.

2. Stop motion mechanism as claimed in claim 1 for spinning and liketextile frames having a retaining pressing roller and a drawing pressingroller and companion rollers cooperative with said pressing rollers todraw out the yarn, said mechanism including a multi-armed lever pivotedto the weight-influenced lever, and carrying said retaining pressingroller and said drawing pressing roller.

GORDON SCOTT FRASER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

